WheelchairDriver.com  

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Updated:  06-Apr-10

Welcome

1. POWERCHAIR ONLY:
Detailed Full PowerChair Related ONLY Menu HERE

2. VEHICLE ONLY:
Detailed Wheelchair Accessible Vehicles ONLY menu HERE

3. EVERYTHING ELSE:
Detailed Menu of Everything else HERE!


MY OWN VEHICLES:
Dodge Grand Caravan


VW Caravelle VR6

MY HOME BUILT ULTIMATE POWERCHAIRS:
My SLIGHTLY Modified Improved Powerchair

Part 1 | 2 | 3 | 4 | 5 | 6

My VERY Modified Off Road & All terrain DO ALL Powerchair!
Part 1 | 2 | 3


MISCELLANEOUS POWERCHAIR RELATED:
What Goes Wrong Power Wheelchairs

Powerchair Tyres

Drive your Powerchair by Radio Control

Powerchairs & Range


Off Road DO ALL Indoor & Outdoor Powerchairs

Off Road ONLY Outdoor Powerchairs & 4x4
Page 1 | 2

Manual or Electric Wheelchair?

Why ALL Powerchairs NEED  to be Off Road Capable!

Choosing  a Suitable Powerchair

Wheelchair Width


BATTERY AND ELECTRICAL (POWERCHAIRS & SCOOTERS + MOTOR VEHICLES):
Batteries for Both Vans & Power Wheelchairs


Inverters & Chargers

Very flexible charger!


Charging Batteries

Fast Charge Your Power Wheelchair

Which batteries to buy


"DRIVE FROM A WHEELCHAIR" VEHICLES:
Dodge Grand Caravan 1

Dodge Grand Caravan 2
Dodge Grand Caravan 3
Dodge Grand Caravan 4

Latest 2008 2009 2010 Disabled Converted Dodge Chrysler And Voyager Minivans
 
Chrysler Voyager Entervan Diesel

Suzuki Wagon R

More Here

Mercedes Vito - soon!
Kia Sedona - soon!


INSURANCE:
Modified Disabled Vehicle Insurance

Breakdown Cover

USED VEHICLES & OTHER EQUIPMENT:
Disabled Adapted Cars

WHEELCHAIR TRANSPORT
& DRIVE BY TRANSFERRING:


VW Caravelle

Dodge Grand Caravan can be used to transport up to 4 Wheelchair Seated Occupants

Fiat Doblo

Renault Kangoo - soon!
Citroen Berlingo
- soon!
Citroen Dispatch
- soon!
Kia Sedona
- soon!
Volkswagen Sharan
Mercedes Vaneos
Toyota Hiace
Fiat Multiplas
(Wheelchair
passenger travels in the front)

Kangoo ASSIST
(wheelchair
passenger transfers & drives)


ESSENTIAL DISABLED
EQUIPMENT STUFF:

Understanding


Grabbers
>

Puncture proof tyres

Run Flat tyres

Tyre Weld Aerosol

Fuses!

Spare Key


Wheelchair Ramps

Small Generator

Tools!


VEHICLE ADAPTATIONS:
Control Systems etc
Hand Controls Manual
Hand Controls Electronic
Van / Car Door openers
Van / Car Wheelchair Tie Downs

 


OTHER STUFF:
Used Disabled Equipment for sale

How to lose weight  FAST!

Email about modifying powerchairs

Keep it looking new 1 2

My Accident!


Climate Change

Electric Cars are a Joke!

Disclaimer & About Me

Site Map

Contact

Links

John Williamson


Powerchair Battery SOC Chart  - How to check the state of charge of your powerchair batteries!

Want to know how deeply you are actually discharging your Powerchair Batteries?

Its easy, and you can do this yourself daily.  Its very important to know for a number of reasons.

Detailed PowerChair ONLY Menu

First of all you only need two things. Knowledge (on this page) and a Digital Volt Meter.

These are available if you don't have one in many places including eBay.

All it needs to do is read VOLTS accurately.

The batteries in your wheelchair are 12v Lead Acid Deep Cycle batteries. In about 99 percent of all current powerchairs. They are generally wired in pairs, and connected in series. 

The chart below will apply to ONE battery only! You will need to double those voltage figures if you measure both batteries together Obviously.

Now how do you measure these voltages? And When?  Well to begin with you will need to switch OFF your Powerchair and wait at least 4 hours to get a true reading.

Overnight is better still. You cannot get very accurate reading just after charging or using your Powerchair. The voltage has to "settle" or "stabilise" so you just have to wait!  Although after say 30 minutes or so after you arrive home you will often get a reasonable idea.  With this in mind, how do you do a quick and dirty "read"?

Take a look at your powerchairs charge socket. In most modern powerchairs it generally has three holes for the "pins" in your chargers plug.

Two of these connect directly to the wheelchairs batteries. The third you can ignore.  It is used in programming, and inhibiting your chairs movement while charging.

The two we want are generally the bottom two. If you carefully stick the Volt meter probes into these two holes then it will read the true battery voltage.

 It will be about 24v to 27v.  If you have it connected backwards it will read minus this amount!  If you connect to the wrong pin it will read nothing, or a strange figure, but wont hurt anything. 

Then see the chart below.  You will need to half your measured figure as you are measuring a pair of batteries connected in series or in line. 

Do not let the two probes touch each other as that will cause a big bang and melt or damage something! Be careful. Read my Disclaimer!

Failing this, just read the voltage directly from the battery, individually - but that means accessing them. Not so easy! 

Approx State Of Charge Chart for Wheelchair (Powerchair) DEEP CYCLE batteries

State of Charge Sealed or Flooded Lead Acid Volts Sealed Gel battery Volts Sealed AGM battery Volts Result on longevity
100% 12.70+ 12.90+ (Usually 13.2) 12.80+  (Usually 12.9) Very Long life!!!
75% 12.40 12.70 to 12.85 12.60 Many 1000's of Cycles
50% 12.20 12.40 to 12.50 12.30 Around a 1000 Cycles
25% 12.00 12.20 to 12.30 12.10 200 to 400 Cycles
0% 11.80 11.9 to 12.00 11.90 Few Tens of Cycles

Note.  When many batteries (especially Gel) get to the lower 50 percent charge level, performance, acceleration, ability to steer or climb ramps is diminished and the battery "feels" flat.  This applies mostly to Gel, and to higher powered "faster" powerchairs. It means that the last part of the batteries actual capacity is not actually usable.  In this way they tend to last longer since they seldom get discharged as deeply.  AGM batteries though offer superior performance on hi end powerchairs because they suffer less from this effect. So a nominally "smaller" capacity battery has equal or better range.

Detailed PowerChair Only Menu

 

 

 

 

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